#include <iostream>
#include "../Sales_item.h"

int main()
{
    Sales_item total;

    if (std::cin>>total)
    {
        Sales_item trans;

        while(std::cin>>trans)
        {
            if (total.isbn() == trans.isbn())
                total += trans;
            else
            {
                std::cout<<total<<std::endl;
                total = trans;
            }
        }
        std::cout<<total<<std::endl;
    }
    else
    {
        std::cerr << "No DATA?" << std::endl;
        return -1;
    }
    return 0;
}
